I had numb patches after both births (vaginal, episiotomy and forceps with one, neither epidural), mostly parts of my legs but also one patch on my back. Got the feeling back in my legs after two or three weeks, but still (32 years on) have the numb patch on my back. Mostly I don't notice it but every now and again it itches like fuck.

You're two weeks in and still feeling numb, yes, check with your GP. Not sure what they can do, though.

Two weeks is FAR too early to diagnose if permanent nerve damage has been done. This can take months and months, if not longer. I have had 14 major surgeries and had significant sensation issues with several of them. For a few of them, it took a couple of years for full feeling to come back. I know you're worried, but try to relax and let your body heal itself.